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  1. #1
    mjh3ides's Avatar
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    Pressure reliefs

    I know some people have tested & use larger relief valves that will flow more water than the 3/8 Jetworks. I've seen mention of valves from McMaster being used but couldn't find them on their site. Can anyone give me a part # or recommendation on what is working well for them.

    My second question is what is the optimal opening psi for the GPR, & does it differ based on the size & type of valve? Just a guess, but I'm assuming if the pressure is too low the prop won't stay loaded enough under hard acceleration & will cause cavitation.


  2. #2
    Moderator Insanediego Joe's Avatar
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    go to a home depot or lowes and find 2-1" brass well valves. The big valves should be set to open at 16-20psi

  3. #3
    Duke's Avatar
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    Quote Originally Posted by Insanediego Joe View Post
    go to a home depot or lowes and find 2-1" brass well valves. The big valves should be set to open at 16-20psi
    +1

    Spring pressure is irrelevant due to the vacuum holding them shut. Never had one of the bigger valves cavitate. BTW a 1" valve can only flow about what a 1/2 pipe can supply.

  4. #4
    o uncola o's Avatar
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    Quote Originally Posted by Insanediego Joe View Post
    go to a home depot or lowes and find 2-1" brass well valves. The big valves should be set to open at 16-20psi

    Do you have a picture of this valve? I was going to use dual jetworks valves.

  5. #5
    Moderator Insanediego Joe's Avatar
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    here you go
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  6. #6
    Duke's Avatar
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    Here is a pic after I cut half the valve off for better flow.
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  7. #7
    mjh3ides's Avatar
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    Quote Originally Posted by Insanediego Joe View Post
    go to a home depot or lowes and find 2-1" brass well valves. The big valves should be set to open at 16-20psi
    Quote Originally Posted by Duke View Post
    +1

    Spring pressure is irrelevant due to the vacuum holding them shut. Never had one of the bigger valves cavitate. BTW a 1" valve can only flow about what a 1/2 pipe can supply.
    Thanks guys. Never thought about the pump creating vacuum but that makes sense.

    Quote Originally Posted by Duke View Post
    Here is a pic after I cut half the valve off for better flow.
    1/4NPT fitting??

  8. #8
    WATER WOODY's Avatar
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    Here's my setup with 1" valves.
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  9. #9
    Duke's Avatar
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    Quote Originally Posted by mjh3ides View Post
    Thanks guys. Never thought about the pump creating vacuum but that makes sense.


    1/4NPT fitting??
    In the picture is 1/2" NPT but 3/8" NPT works fine with those valves. Don't put anything behind the plunger because that will shroud the valve and restrict flow dramatically.

  10. #10
    L Carlson's Avatar
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    Mc Master-Carr Part #

    48935k35 Vacuum/Pressure Adjustable Brass Relief Valve, 3/8 male, 0-20 psi
    5485k23 Medium Pressure Brass Hex Nipple, 3/8
    50785k37 Medium- Pressure Brass Threaded Pipe Fitting,3/8, 90 degree elbow female
    I bought a set of 2 and to my door it was $36 and change
    Duke do you suggest 2 of these valves on a seadoo pump or just one?

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